World sea water temperatures

Water temperature in Boulder City (NV) in September

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Is it warm enough to swim in Boulder City in September? Average water temperature in Boulder City in September is 86.4°F and therefore suitable for comfortable swimming. The warmest water in Boulder City in September is 96.8°F, and the coldest is 77°F. To find out the water temperature today and in the coming days, go to Current water temperature in Boulder City

Changes water temperature in Boulder City in September 2025, 2024

To get an accurate forecast for the water temperature in Boulder City for any chosen month, compare two years within a 10 year range using the chart below.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024
September 182.4°F84.2°F
September 284.2°F84.2°F
September 382.4°F82.4°F
September 482.4°F84.2°F
September 582.4°F84.2°F
September 682.4°F82.4°F
September 784.2°F84.2°F
September 882.4°F84.2°F
September 982.4°F84.2°F
September 1080.6°F84.2°F
September 1178.8°F82.4°F
September 1278.8°F80.6°F
September 1380.6°F82.4°F
September 1482.4°F82.4°F
September 1582.4°F80.6°F
Day 2025 2024
September 1680.6°F78.8°F
September 1780.6°F77°F
September 1882.4°F78.8°F
September 1980.6°F77°F
September 2082.4°F77°F
September 2182.4°F77°F
September 2280.6°F78.8°F
September 2382.4°F80.6°F
September 2480.6°F82.4°F
September 2580.6°F80.6°F
September 2680.6°F80.6°F
September 27 80.6°F
September 28 80.6°F
September 29 80.6°F
September 30 80.6°F

Boulder City water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in September?

Want to know where the water temperature in September is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Boulder City is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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